Centrifugal pump and method of producing centrifugal pump

ABSTRACT

A centrifugal pump includes a metallic main body casing in which a rotating blade member is accommodated. The metallic main body casing includes an upper main body casing, a lower main body casing which is fixed to the upper main body casing, and a blade casing, which partitions an interior space formed by the upper main body casing and the lower main body casing so that a fluid introducing passage is formed at an upper portion, and a rotating accommodating space that accommodates the rotating blade member is formed at a lower portion. An edge of the blade casing is airtightly fixed to the upper main body casing or the lower main body casing.

The present application claims priority to Japanese Application No. 2014-149083 filed Jul. 22, 2014 and Japanese Application No. 2015-083845 filed Apr. 16, 2015, which are both incorporated herein by reference.

TECHNICAL FIELD

Embodiments relate to a centrifugal pump and a method of producing of the centrifugal pump to circulate the fluid in the closed circuit, for instance, refrigerant used for refrigerant circulation circuits such as air conditioners and freezers, and cooling water etc. used for cooling circulation circuits such as parts and apparatuses that generate heat.

Moreover, this centrifugal pump is a centrifugal pump in which the resisting pressure and airtight are required.

BACKGROUND ART

Conventionally, as such a centrifugal pump to circulate the liquid, Patent Document 1 (JP 2003-13878, A) is open to the public. In this Patent Document 1, a centrifugal pump is disclosed, in which the structure of the impeller member is improved so that a plurality of passage portions that extend radially from the center of the impeller member are formed.

As a result, the circulation amount change of cooling water is low, and the change in the cooling capability is not generated easily.

Moreover, in Patent Document 2 (JP 2003-161284, A), the impeller member is disposed wherein a plurality of the blades are formed to the outer periphery and the rotor magnet is provided to the inner periphery.

In addition, the motor stator is disposed to the inner periphery side of the rotor magnet.

As a result, a thin centrifugal pump that can achieve an efficient cooling is disclosed.

SUMMARY Problems to be Solved

However, in such a conventional centrifugal pump, it is not a strong airtight structure.

For instance, cooling water such as internal combustion engines; and fluid of refrigerant etc. used for refrigerant circulation circuits etc. such as air conditioners and freezers; and combustibility fluid; and fluid having toxicity etc. are circulated in closed circuit.

In such case, there are problems in the resisting pressure and the air-tight of the centrifugal pump.

Moreover, in the structure of a conventional centrifugal pump, the coil portion that is the motor stator cannot be detached.

Therefore, in order to use it for the centrifugal pump in which the resisting pressure and the air-tight are required, even if the casing and the piping, etc. of metallic are used, it cannot be fixed by heating such as the welding, the brazing, and the adhesion, etc.

In addition, the bearing of the impeller member consists of bearing which is disposed to one side of the shaft of the impeller member.

Therefore, it is unstable, and there are problems in durability and quietness.

Moreover, in such a centrifugal pump having the conventional structure, the bearing is in the fluid, and the lubricant cannot be used.

Therefore, the axial member and the impeller member are wear-out and damaged by rotating of the impeller member.

As a result, the rattling and the decentering are caused in the impeller member.

It is difficult to keep the pump performance having the predetermined objects.

Moreover, such a centrifugal pump is provided with the structure schematically shown in FIG. 9.

That is, as shown in FIG. 9, a centrifugal pump 200 is provided with a metallic main body casing 204 in which the rotating blade member (not shown) is accommodated.

The main body casing 204 is provided with an upper main body casing 206.

The upper main body casing 206 comprises a top wall 208 and a side peripheral wall 210 on a suction side which extends downwardly from an outer periphery of the top wall 208.

Moreover, as shown in FIG. 9, on the side peripheral wall 210 of the upper main body casing 206, an opening portion 210 a, to which a metallic suction side coupling member 212 (i.e. sucking side pipe) is fixed, is formed.

As shown in FIG. 9, on this opening portion 210 a, the suction side coupling member 212 is sealingly fixed by, for instance, such as the welding, the soldering and the adhesion.

As a result, the suction side coupling member 212 is connected to the main body casing 204.

Moreover, as shown in FIG. 9, on the side peripheral wall 210 of the upper main body casing 206, to oppose to the opening portion 210 a to fix the suction side coupling member 212, a side peripheral wall 232 on a discharge side, in which an opening portion 210 b to fix a metallic discharge side coupling member 230 (discharge side pipe) is formed, is formed.

As shown in FIG. 9, on this opening portion 210 b, the discharge side coupling member 230 is sealingly fixed by, for instance, such as the welding, the brazing and the adhesion.

As a result, the discharge side coupling member 230 is connected to the main body casing 204.

In addition, as shown in FIG. 9, the main body casing 204 is provided with a lower main body casing 216 (rotor casing) and a blade casing 222.

Moreover, an outer periphery flange 224 of this blade casing 222 is sealingly fixed, for instance, by such as the welding, the brazing and the adhesion, in the state that it is sandwiched between a lower end 218 of the side peripheral wall 210 of the upper main body casing 206 and an outer periphery flange 220 of the lower main body casing 216.

As a result, an interior space S1, which is surrounded by the upper main body casing 206 and the lower main body casing 216, is formed in the main body casing 204 (see FIG. 12 (A) described later).

As a result, a rotating accommodating space S2 is formed by the blade casing 222 and the lower main body casing 216 (see FIG. 12 (B) described later).

As a result, as shown by arrow C in FIG. 9, the fluid sucked from the suction side fitting member 212 is introduced into the rotating accommodating space S2 from the fluid introducing path 226, which is formed by the blade casing 222 and the upper main body casing 206.

In addition, by the turning force of the rotating blade member (not shown), as shown by arrow D of FIG. 9, the fluid introduced into the rotating accommodating space S2 is discharged through the discharge side coupling member 230 from the rotating accommodating space S2 of the main body casing 204.

As shown in the enlarged view of FIG. 10, while operating such centrifugal pump 200, the outer periphery portion of the rotating blade member is positioned on a high-pressure side by the rotation power of the rotating blade member.

As a result, the side on the fluid introducing passage 226, which is formed by the blade casing 222 and the upper main body casing 206, is positioned on a low-pressure side.

Therefore, as shown in the enlarged view of FIG. 10, if the clearance (i.e. passage) is existed on a joint portion 240 between blade casing 222 and the main body casing 204, fluid is flowed backward from the rotating accommodating space S2, which is a high-pressure side, to the side of the fluid introducing passage 226.

Consequently, the efficiency of the centrifugal pump 200 is decreased (See arrow E of FIG. 10).

Therefore, the joint portion 240 of the blade casing 222 and the main body casing 204 should be separated airtightly.

However, in the centrifugal pump 200 having the structure as FIG. 9, it is necessary that the outer periphery flange 224 of the blade casing 222 is sandwiched and fixed between a lower end 218 of the side peripheral wall 210 of the upper main body casing 206 and an outer periphery flange 220 of the lower main body casing 216 (i.e. necessary that three members are fixed at the same time).

Therefore, there is fear that the clearance is generated by piling up three members, i.e. the blade casing 222, the upper main body casing 206, and the lower main body casing 216.

As a result, for instance, fixing by the welding, the brazing, and the adhesion, etc. is difficult.

As a countermeasure, for instance, as shown in FIG. 11, the outer periphery flange 224 of the blade casing 222 is bended so that a sealing member installation groove 242 is formed on the outer periphery flange 224 of blade casing 222.

Consequently, the air-tight is improved by providing a sealing member 244 such as O ring and gasket in this sealing member installation groove 242.

However, in this case, there is a case that the sealing member 244 is deteriorated by the time elapse, and deterioration is advanced by the fluid.

As a result, the leakage is caused in the sealing portion, the backflow is generated, and the efficiency of the centrifugal pump 200 is decreased.

Moreover, like this, if the sealing member installation groove 242 is formed, the manufacturing process is increased because of the complex structure, and the cost is high.

In addition, the centrifugal pump 200 itself is enlarged.

Such a current state is considered and embodiments may provide an excellent centrifugal pump in the pump performance and a method of producing of the centrifugal pump.

In the centrifugal pump, it can be fixed by heating such as the welding, the brazing, and the adhesion, etc. and the metal casing and the piping having high airtight can be used.

Moreover, the centrifugal pump can be used for the centrifugal pump, in which for instance, a refrigerant, a combustible fluid, and the fluid having a toxicity are circulated in the closed circuit, and in which the resisting pressure, airtight, and resistance to corrosion are required.

Solution to Problem

The invention was invented to achieve the problem and the purpose in the above-mentioned prior art.

The centrifugal pump comprises:

a metallic main body casing in which a rotating blade member is accommodated,

the main body casing comprising;

an upper main body casing,

a lower main body casing which is fixed to the upper main body casing, and

a blade casing, which partitions an interior space formed by the upper main body casing and the lower main body casing so that

a fluid introducing passage is formed at an upper portion, and

a rotating accommodating space that accommodates the rotating blade member is formed at a lower portion,

wherein an edge of the blade casing is airtightly fixed to the upper main body casing or the lower main body casing.

Moreover, the method of producing of the centrifugal pump, wherein the centrifugal pump comprises:

a metallic main body casing in which a rotating blade member is accommodated,

the main body casing comprising;

an upper main body casing,

a lower main body casing which is fixed to the upper main body casing, and

a blade casing, which partitions an interior space formed by the upper main body casing and the lower main body casing so that

a fluid introducing passage is formed at an upper portion, and

a rotating accommodating space that accommodates the rotating blade member is formed at a lower portion,

comprises airtightly fixing an edge of the blade casing to the upper main body casing or the lower main body casing.

By composing like this, the edge of the blade casing is airtightly fixed to the upper main body casing or the lower main body casing.

As a result, a sealing state is generated between the blade casing and the upper main body casing, or between the blade casing and the lower main body casing.

Therefore, since it is the fixing of two members, fear that the clearance is generated, is a little.

It need not to press fit, weld, and it is easy to fix, for instance by the welding, the brazing, and the adhesion, etc.

Moreover, the complex structure, in which sealing members such as O ring and gaskets are provided in the sealing member installation groove, need not be adopted.

In addition, the sealing member is not deteriorated by the time elapse, and deterioration is not advanced by the fluid.

As a result, the leakage is not caused in the sealing portion, the backflow is not generated, and the efficiency of the centrifugal pump is not decreased.

In addition, the sealing member installation groove need not be formed like this.

Therefore, a lot of manufacturing processes can be unnecessary, and the cost can be reduced because of an easy structure.

Moreover, the centrifugal pump can be made compact.

Moreover, the method of the fixing in the airtight state is a fixing by welding, brazing or adhesion.

Thus, as for the method of the fixing between the blade casing and the upper main body casing, or between the blade casing and the lower main body casing, it can be easy to adopt the fixing by the welding, the brazing or the adhesion, and reduce the cost.

Moreover, in case of the brazing, when the suction side coupling member and the discharge side coupling member are brazed to the main body casing, brazing is possible by the same atmosphere, and it can be processed at the same time.

The manufacturing process can be simplified, and the cost can be reduced.

Moreover, on a vicinity of the fixing portion of at least one of the upper main body casing, the blade casing, and the lower main body casing, a groove for flow stop which prevents the fixing material from flowing is formed.

By composing like this, by the groove for flow stop, which is formed on a vicinity of the fixing portion of at least one of the upper main body casing, the blade casing, and the lower main body casing, for instance, the fixing material, such as an electrode in the welding, a wax material in the brazing, and an adhesion material at the adhesion, can be prevented from flowing.

As a result, the welding, the soldering, and the adhesion can be never obstructed, an extra fixing material can be reduced, and the cost can be reduced.

In addition, the flowing of the fixing material can be prevented by the groove for flow stop.

As a result, obstruction of the fluid flow by hardening of the fixing material can be prevented and the efficiency of the centrifugal pump is not decreased.

Moreover, the groove for flow stop is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing.

By composing like this, it may be only to be formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing.

As a result, the processing is easy and the cost can be reduced.

Moreover, the groove for flow stop is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing to a groove shape.

By composing like this, it may be only to form the groove for flow stop to the groove shape by bending at least one of the upper main body casing, the blade casing, and the lower main body casing, for instance, by press work etc.

As a result, the processing is easy and the cost can be reduced.

Moreover, the groove for flow stop is formed by providing a groove forming member for the groove forming to at least one of the upper main body casing, the blade casing, and the lower main body casing.

By composing like this, the groove for flow stop can be formed by providing a groove forming member for the groove forming to at least one of the upper main body casing, the blade casing, and the lower main body casing.

As a result, the upper main body casing or the lower main body casing need not be processed to the complicate shape.

As a result, the processing is easy and the cost can be reduced.

Advantageous Effects

The edge of the blade casing is airtightly fixed to the upper main body casing or the lower main body casing.

As a result, it is a sealing state between the blade casing and the upper main body casing, or between the blade casing and the lower main body casing.

Therefore, since fixing is between two members, fear that the clearance is generated, is a little.

It need not to press fit, weld, and it is easy to fix, for instance by the welding, the brazing, and the adhesion, etc.

Moreover, the complex structure, in which sealing members such as O ring and gaskets are provided in the sealing member installation groove, need not be adopted.

In addition, the sealing member is not deteriorated by the time elapse, and deterioration is not advanced by the fluid.

As a result, the leakage is not caused in the sealing portion, the backflow is not generated, and the efficiency of the centrifugal pump is not decreased.

In addition, the sealing member installation groove need not be formed like this.

Therefore, a lot of manufacturing processes can be unnecessary, and the cost can be reduced because of an easy structure.

Moreover, the centrifugal pump can be made compact.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a longitudinal sectional view which shows the Embodiment of the centrifugal pump.

FIG. 2 is a partial enlarged sectional view which shows another Embodiment of the centrifugal pump of FIG. 1.

FIG. 3 is a partial enlarged sectional view which shows another Embodiment of the centrifugal pump of FIG. 1.

FIG. 4 is a partial enlarged sectional view similar to FIG. 2 in which another Embodiment of the centrifugal pump of is shown.

FIG. 5 is a partial enlarged sectional view of FIG. 4.

FIG. 6 is a partial enlarged sectional view similar to FIG. 2 in which another Embodiment of the centrifugal pump is shown.

FIG. 7 is a partial enlarged sectional view similar to FIG. 2 in which another Embodiment of the centrifugal pump is shown.

FIG. 8 is schematic cross-sectional view in which another Embodiment of the centrifugal pump is shown.

FIG. 9 is schematic cross-sectional view in which the structure of the centrifugal pump is shown.

FIG. 10 is a partial enlarged sectional view which shows the problem in the structure of the centrifugal pump.

FIG. 11 is a partial enlarged sectional view which shows the problem in the structure of the centrifugal pump.

FIG. 12 is a schematic cross-sectional view, in which disposing of the internal space S1, the fluid introducing passage 84, and the rotating accommodating space S2 of the centrifugal pump of FIG. 1 are explained.

DESCRIPTION OF EMBODIMENTS

Hereafter, the embodiments are described in detail or more on the basis of the drawing.

Embodiment 1

FIG. 1 is a longitudinal sectional view which shows the Embodiment of the centrifugal pump.

FIG. 2 is a partial enlarged sectional view which shows another Embodiment of the centrifugal pump of FIG. 1.

FIG. 3 is a partial enlarged sectional view which shows another Embodiment of the centrifugal pump of FIG. 1.

In addition, in the specification, the wordings, such as “upper side”, “upper portion”, “upper”, “lower side”, “lower portion”, and “lower” which show vertical direction, indicate the vertical direction in each drawing.

Moreover, they indicate a relative position of each member and they do not indicate absolute position.

In FIG. 1-FIG. 2, reference numeral 10 shows a centrifugal pump as a whole.

As shown in FIG. 1-FIG. 2, a centrifugal pump 10 comprises a rotating blade member 12.

As shown in FIG. 1-FIG. 2, this rotating blade member 12 comprises a plurality of blade members 16, which extend radially in the direction of the outer periphery in an upper part of a circular tube bearing portion 14.

In addition, the number of sheets of this blade member 16 may be elected according to the usage of centrifugal pump 10 and the pump ability that is required, and is not limited especially.

As shown in FIG. 1, the blade member 16 is provided with a base edge 18 which extends from the bearing portion 14 in the upward direction of the outer periphery,

an enlarged diameter portion 20, which is enlarged upwardly in the direction of the outer periphery from this base edge 18, and

an outside blade portion 22, which extends from this enlarged diameter portion 20 in direction of outer periphery.

By forming the shape of the blade member 16 to such shape, the discharge ability can be improved by function of the outside blade portion 22 by rotating of the blade member 16.

Moreover, on the rotating blade member 12, a rotor magnet accommodating portion 24 is formed on the outer periphery of bearing portion 14 at the predetermined space and is formed to the outer periphery of the base edge 18.

The rotor magnet accommodating portion 24 is provided with a flange portion 26 which extends downwardly from a lower side of the base edge 18, and a support portion 28 in which a tip of the flange portion 26 is enlarged.

Moreover, to an installation portion 30 which includes these flange portion 26 and support portion 28, a setting hole 32 a of a rotor magnet 32, which includes an annular permanent magnet, is fitted.

As a result, fall of the rotor magnet 32 is prevented by the enlarged support portion 28.

Furthermore, as shown in FIG. 1, the centrifugal pump 10 is provided with a metallic main body casing 34 in which the rotating blade member 12 is accommodated.

The main body casing 34 is provided with an upper main body casing 36.

The upper main body casing 36 comprises a top wall 38 and a side peripheral wall 40 which extends downwardly from an outer periphery of the top wall 38.

Moreover, as shown in FIG. 1 and FIG. 2, on the side peripheral wall 40 of the upper main body casing 36, a flange 44, in which an opening portion 40 a to fix a metallic suction side coupling member 42 is formed, is formed.

As shown in FIG. 1, on this flange 44, the suction side coupling member 42 (sucking side pipe) is sealingly fixed by, for instance, such as the welding, the soldering and the adhesion.

As a result, the suction side coupling member 42 is connected to the main body casing 34.

Moreover, as shown in FIG. 1, on the side peripheral wall 40 of the upper main body casing 36, to oppose to the opening portion 40 a to fix the suction side coupling member 42, a flange 50, in which an opening portion 40 b to fix a metallic discharge side coupling member 46 (discharge side pipe) is formed, is formed.

In this case, the position of the flange 44 and the flange 50 is not limited, and they can be disposed by shifting the central angle degree (for instance, the central angle degree is shifted 45 degree).

In addition, this shifting angle can not be especially limited, and can be changed by the design change according to the usage etc.

As shown in FIG. 1, on this flange 50, the discharge side coupling member 46 is sealingly fixed by, for instance, such as the welding, the brazing and the adhesion.

As a result, the discharge side coupling member 46 is connected to the main body casing 34.

Moreover, as shown in FIG. 1 and FIG. 2, the main body casing 34 is provided with a lower main body casing 48 (rotor casing).

In addition, on an inner wall of a lower end 51 of the side peripheral wall 40 of the upper main body casing 36, an outer periphery flange 52 of the lower main body casing 48 is sealingly fixed by, for instance, such as the welding, the brazing and the adhesion.

As a result, as shown in FIG. 12 (A), in the main body casing 34, an interior space S1, which is surrounded with the upper main body casing 36 and the lower main body casing 48, is formed.

As shown in FIG. 1, this lower main body casing 48 is provided with a blade accommodating portion 54, which extends horizontally from an outer periphery flange 52 of the lower main body casing 48 to inner periphery side, and a rotor magnet accommodating portion 56, which extends downwardly from this blade accommodating portion 54.

In addition, under this rotor magnet accommodating portion 56, a lower bearing member accommodating portion 58, which has a bottom and is cylindrical shape, is formed.

Moreover, in the lower bearing member accommodating portion 58, a lower bearing member 60 is fitted by, for instance, press fit etc.

In a shaft hole 62 formed on this lower bearing member 60, a lower end portion 66 of an axial member 64 is fixed as pivoted by, for instance, press fit etc. by means of a thrust washer 61.

Moreover, in the bearing portion 14 of this rotating blade member 12, the axial member 64 is passed through so that the rotating blade member 12 can be rotated around.

In addition, as shown in FIG. 1 and FIG. 2, the main body casing 34 is provided with a blade casing 68, which includes a division casing connected to the main body casing 34 to divide inside of the main body.

This blade casing 68, on the side of the suction side coupling member 42, an outer periphery flange (i.e. edge) 70 of this blade casing 68 is sealingly fixed under the flange 44 of the side peripheral wall 40 of the upper main body casing 36 for instance, by such as the welding, the brazing and the adhesion.

In addition, the enlarged view of FIG. 2 indicates the case of brazing and the enlarged view of FIG. 3 indicates the case of the welding.

Both compositions comprising only a fixing portion 70 a are shown.

The composition in which the abutting portion 70 b described later is not provided is shown for convenience′ sake about the clarification.

Moreover, in case of FIG. 3, the fixing portion 70 a is made flange shape to facilitate welding.

By composing like this, the edge of the blade casing 68 (i.e. the outer periphery flange 70 of the blade casing 68) is fixed sealingly to the upper main body casing 36.

As a result, it is a sealing state between the blade casing 68 and the upper main body casing 36.

Therefore, since the fixing is between two members, i.e., the blade casing 68 and the upper main body casing 36, fear that the clearance is generated, is a little.

It need not to press fit, weld, and it is easy to fix, for instance by the welding, the brazing, and the adhesion, etc.

Moreover, as shown in FIG. 11, the complex structure, in which sealing member 244 such as O ring and gaskets is provided in the sealing member installation groove 242, need not be adopted.

In addition, the sealing member 244 is not deteriorated by the time elapse, and deterioration is not advanced by the fluid.

As a result, the leakage is not caused in the sealing portion, the backflow is not generated, and the efficiency of the centrifugal pump is not decreased.

In addition, the sealing member installation groove 242 need not be formed like this.

Therefore, a lot of manufacturing processes can be unnecessary, and the cost can be reduced because of an easy structure.

Moreover, the centrifugal pump can be made compact.

Moreover, in case of the brazing, when the suction side coupling member 42 and the discharge side coupling member 46 are brazed to the main body casing 34 (i.e. the upper main body casing 36 and the lower main body casing 48), brazing is possible by the same atmosphere, and it can be processed at the same time.

The manufacturing process can be simplified, and the cost can be reduced.

Moreover, as shown in FIG. 1, the outer periphery flange 70 of blade casing 68 comprises:

a fixing portion 70 a to fix under the flange 44 of the side peripheral wall 40 of the upper main body casing 36, and

an abutting portion 70 b which extends and is curved upwardly in the direction of vertical direction from this fixing portion 70 a.

This abutting portion 70 b, about a opening portion 40 a of the side peripheral wall 40 of the upper main body casing 36 of the main body casing 34 to connect suction side coupling members 42, functions as a stopper to prescribe the insert position of the suction side coupling member 42.

This abutting portion 70 b extends to the position that abuts to a tip 42 a of the suction side coupling member 42 on the side of the main body casing 34.

Moreover, in this case, the abutting portion 70 b does not extend to the inside diameter portion of the suction side coupling member 42.

As a result, the flow of the fluid from the suction side coupling member 42 is not obstructed.

As a result, the tip 42 a of the suction side coupling member 42 on the side of the main body casing 34 abuts to the abutting portion 70 b of the outer periphery flange 70 of this blade casing 68.

Therefore, the insert position of the suction side coupling member 42 to the opening portion 40 a on the coupling side of the suction side of the side peripheral wall 40 of the upper main body casing 36 is prescribed.

Therefore, the insert position area of the suction side coupling member 42 to the opening portion 40 a on the suction side coupling side of side peripheral wall 40 of upper main body casing 36 is not a shortfall.

As a result, for instance, the amount of the wraparound of the braze material etc. is not decreased, and the joint area is not decreased.

Consequently, the strength shortfall of the fixing of the suction side coupling member 42 to the flange 44 is not generated so that the defect of airtight is not generated.

Moreover, according to this composition, the suction side coupling member 42 is not too much inserted in the opening portion 40 a on the suction side coupling side of the side peripheral wall 40 of the upper main body casing 36.

As a result, the distance between the side peripheral walls 72 of the blade casing 68 is not small so that the flow of the fluid from the suction side coupling member 42 is never obstructed as described later.

On the other hand, as for the blade casing 68, an opening portion 72 a is formed to the side peripheral wall 72 of the blade casing 68 on the side of the discharge side coupling member 46.

The periphery of the opening portion 72 a of this side peripheral wall 72 is sealingly fixed to the flange 50 of the side peripheral wall 40 of the upper main body casing 36 together with the discharge side coupling member 46, for instance, by such as the welding, the brazing and the adhesion.

Though not shown in the drawing, on the side of the discharge side coupling member 46, an abutting portion, which extends as its inside diameter becomes small from the opening portion 72 a of the side peripheral wall 72 of the blade casing 68, may be provided.

In addition, the numbers of these abutting portions 70 b or the position where these abutting portions 70 b are disposed are not especially limited.

For instance, even one piece is acceptable respectively. Moreover, they may be also respectively formed all around in the circumferential direction of the suction side coupling member 42. Moreover, plurality of the abutting portions 70 b may be respectively disposed in the circumferential direction at the predetermined space.

Moreover, the blade casing 68 is provided with a side peripheral wall 72, which extends upwardly from the outer periphery flange 70, and

an extending portion 74, which extends from the side peripheral wall 72 along the outside blade portion 22 of the impeller member 16 in the direction of a horizontally inside.

By having such shape, between the blade accommodating portions 54 of the blade casing 68 and the lower main body casing 48, the blade member 16 can be accommodated.

Moreover, to a protruding portion 38 a, which projects downwardly to a central portion of the top wall 38 of the upper main body casing 36, an upper bearing member 78 is fixed by a fixing holder 71, so that it protrudes downwardly in an inner periphery side opening portion 74 a of an extending portion 74 of the blade casing 68.

As a result, by the protruding portion 38 a of the top wall 38 of the upper main body casing 36, the upper bearing member 78 is stabilized and is supported.

Therefore, the decentering and the vibration by the rotation of the rotating blade member 12 can be prevented.

On a shaft hole 80 formed to the upper bearing member 78, a top portion 82 of the axial member 64 passed through in the bearing portion 14 of the rotating blade member 12, for instance, by pressing fit, is fixed as pivoted by a thrust washer 73.

Moreover, as shown in FIG. 1 and FIG. 2, the diameter of the side peripheral wall 72 of the blade casing 68 is formed smaller than the diameter of the side peripheral wall 40 of the upper main body casing 36.

In addition, the height of the side peripheral wall 72 of the blade casing 68 is formed smaller than the height of the side peripheral wall 40 of the upper main body casing 36.

As a result, as shown in FIG. 12 (B), by the blade casing 68, the interior space S1, which is formed by the upper main body casing 36 and the lower main body casing 48, is partitioned.

Consequently, a fluid introducing passage 84 is formed on the upper part.

Moreover, a rotating accommodating space S2, in which the rotating blade member 12 is accommodated, is formed on the lower part.

As a result, as shown by arrow A in FIG. 1, the fluid sucked from the suction side fitting member 42 is passed from the fluid introducing path 84, which is formed by the blade casing 68 and the upper main body casing 36, to the inner periphery side opening portion 74 a of the extending portion 74 of blade casing 68.

Moreover, the fluid that passed through the inner periphery side opening portion 74 a is introduced into the rotating accommodating space S2 formed by the blade casing 68 and the lower main body casing 48.

In addition, as shown in FIG. 1, on the outer periphery of the rotor magnet accommodating portion 56 of the lower main body casing 48, a metallic main body casing side fixing bracket 96 which comprises the detaching means, for instance, is fixed by the welding, the brazing, the adhesion, and the press fitting.

This main body casing side fixing bracket 96, as shown in FIG. 1, an engaging portion 98 is formed as it curves to the inner periphery side and protrudes.

Moreover, as shown in FIG. 1, the centrifugal pump 10 is disposed on the outer periphery of the rotor magnet accommodating portion 56 of the lower main body casing 48 to be located in the periphery of the rotor magnet 32.

In addition, a coil portion 104 which rotates the rotating blade member 12 is provided.

As for the coil portion 104, a plurality of coils 110, which comprise a winding wire 108 rolled in a bobbin casing 106, on an electronic substrate 112 to perform an electronic control, though not shown in the drawing, are disposed in the circumferential direction at constant intervals.

Moreover, these coils 110 are fitted in a coil installation portion 114 a which is formed in a coil cover main body 114 having a substantially cylindrical shape.

Moreover, the coils 110 are fixed by coil cover 111 having a cover shape to the coil cover main body 114 together with electronic substrate 112.

Moreover, as shown in FIG. 1, on the center section of coil portion 104, an accommodating opening portion 118, in which the rotor magnet accommodating portion 56 and the lower bearing member accommodating portion 58 of the lower main body casing 48 are accommodated, is formed.

Moreover, on the center section of the electronic substrate 112, an accommodating opening portion 112 a, in which the lower bearing member accommodating portion 58 of the rotor magnet accommodating portion 56 of the lower main body casing 48 is accommodated, is formed.

On the other hand, an opening portion 114 b is formed to the center section of the coil cover main body 114.

By this opening portion 114 b, the rotor magnet accommodating portion 56 and the lower bearing member accommodating portion 58 of the lower main body casing 48 are accommodated in the accommodating opening portion 118 of the coil portion 104 and the accommodating opening portion 112 a of the electronic substrate 112.

In addition, as shown in FIG. 1, a coil side fixing protrude portion 116 which comprises the detaching means is provided to the coil cover main body 114.

As for coil side fixing protrude portion 116, as shown in FIG. 1, an engaging piece 124, which projects from the opening portion 114 b of the coil cover main body 114 upwardly and projects externally, is formed.

As a result, the engaging portion 98 of the main body casing side fixing bracket 96 is engaged with the engaging piece 124 of the coil side fixing protrude portion 116.

Consequently, the coil cover main body 114, in which the coil portion 104 is accommodated and which is covered by coil cover 111, can be provided detachably under the main body casing 34.

In addition, in FIG. 1, the reference numeral 126 shows a connector and 128 shows a lead line and 130 shows a magnetic pole sensor to detect the direction of the rotation and the position where the rotor magnet 32 is rotated.

According to the centrifugal pump 10 like this, the coil cover main body 114, in which the coil portion 104 is accommodated and which is covered by coil cover 111, and the main body casing 34 are detachably disposed by a detaching means.

In case of this Embodiment, by means of engagement between the engaging portion 98 of the main body casing side fixing bracket 96 and the engaging piece 124 of the coil side fixing protrude portion 116, it is detachably disposed.

Therefore, before the coil cover main body 114, in which the coil portion 104 is accommodated and which is covered by coil cover 111, is fixed to the main body casing 34, for instance, the processing that requires the fixing and heating by heating such as the welding, the brazing, and the adhesion, etc. can be performed to the main body casing 34.

As a result, working ability is improved.

Moreover, the coil cover main body 114, in which the coil portion 104 is accommodated and which is covered by coil cover 111, and the main body casing 34 are detachably fixed by the detaching means.

As a result, the exchange when the coil portion 104 is broken down can be easily performed.

In addition, the direction of the draw of the wire and the direction of the coupling (i.e. the suction side coupling member 42 and the discharge side coupling member 46) can be selected arbitrarily.

However, it is not limited in any way as such detaching means.

For instance, other detaching means such as screw engaging and engaging by the convexo-concave can be adopted.

In addition, the axial member 64 of the rotating blade member 12 is pivoted by the upper bearing member 78 and the lower bearing member 60.

As a result, the bearing of the rotating blade member 12 is a stable structure, and an excellent centrifugal pump 10 in durability and silence can be provided.

That is, the rotation of the rotating blade member 12 is stable, the noise when rotating is reduced, and the vibration of the rotating blade member 12 is reduced, and durability is improved.

Moreover, the axial member 64 of the rotating blade member 12 is fixed to the upper bearing member 78 and the lower bearing member 60.

In addition, the rotating blade member 12 is rotated around the outer periphery of axial member 64.

As a result, the rotation sliding area is increased between rotating blade member 12 and the outer periphery of the axial member 64, and the contact surface pressure is reduced.

As a result, the rotation of the rotating blade member 12 is stable, the noise when rotating is reduced, and the vibration of the rotating blade member 12 is reduced, and durability is improved.

In this case, it is desirable that the rotating part between the rotating blade member 12 and the axial member 64, that is, at least, the inner periphery of the bearing portion 14 of the rotating blade member 12 and the outer periphery of the axial member 64, comprise a synthetic resin having a high slidability.

Therefore, the bearing portion 14 of the rotating blade member 12 and the axial member 64 itself may comprise a synthetic resin having a high slidability.

On the other hand, only the inner periphery of bearing portion 14 of rotating blade member 12 and the surface of the outer periphery of the axial member 64 can be covered by such a synthetic resin having a high slidability.

In this case, as for a synthetic resin having a high slidability, it is not especially limited, for instance, the plastic with excellent chemical resistance such as PPS and PTFE can be used.

Like this, as for the rotating part, the synthetic resin having a high slidability is used, so that in the non-lubrication condition in which the bearing is in the fluid, it is excellent in the slidability.

Moreover, the axial member 64 and the rotating blade member 12 are not wear-out and damaged at all by the rotation of the rotating blade member 12.

As a result, durability is improved and neither the rattling nor the eccentricity is caused in the rotating blade member 12. Consequently, the predetermined and objected pump performance can be retained.

In this case, though not shown in the drawings, the axial member 64 may be fixed to the rotating blade member 12.

Moreover, between the upper bearing member 78 and the axial member 64 and between the lower bearing member 60 and the axial member 64, it is possible that the rotating blade member 12 may be rotated.

By composing like this, the rotation of the rotating blade member 12 is stable, the noise when rotating is reduced, and the vibration of the rotating blade member 12 is reduced, and durability is improved.

In addition, in this case similarly, as for the rotating part between the upper bearing member 78 and the axial member 64 and between the lower bearing member 60 and the axial member 64, the synthetic resin having a high slidability can be used.

The centrifugal pump 10 composed like this is operated as follows.

First of all, the electric current is flowed through the coil 110 of the coil portion 104, so that the coil 110 is excited. As a result, it effects on the rotor magnet 32 of the rotating blade member 12.

Consequently, the rotating blade member 12 can be rotated around the axial member 64, which is passed through the bearing portion 14.

As a result, the blade member 16 of the rotating blade member 12 is rotated.

Consequently, as shown by arrow A of FIG. 1, the fluid sucked from the suction side coupling member 42 is passed from the fluid introducing passage 84, which is formed by the blade casing 68 and the upper main body casing 36, to the inner periphery side opening portion 74 a of the extending portion 74 of the blade casing 68.

Moreover, the fluid passed through the inner periphery side opening portion 74 a is introduced into the rotating accommodating space S2, which is formed by the blade casing 68 and the lower main body casing 48.

In addition, by the turning force of the blade member 16 of the rotating blade member 12, as shown by arrow B of FIG. 1, the fluid introduced into the rotating accommodating space S2 is discharged through the discharge side coupling member 46 from the rotating accommodating space S2 of the main body casing 34.

According to the centrifugal pump 10 composed like this,

the main body casing 34 has a shape, which comprises:

the upper main body casing 36, and

the lower main body casing (i.e. rotor casing) 48 which is fixed to the upper main body casing 36,

the lower main body casing 48 comprising;

the blade accommodating portion 54, which extends horizontally from outer periphery of the lower main body casing 48 to the inner periphery side, and

the rotor magnet accommodating portion 56, which extends downwardly from the blade accommodating portion 54.

Therefore, in the interior space S1 formed between the upper main body casing 36 and the lower main body casing 48 fixed to the upper main body casing 36, the rotating blade member 12, which includes the impeller member 16 and the rotor magnet 32 provided under the impeller member 16, can be accommodated in compact.

Moreover, the coil portion 104, which is disposed to be located in the periphery of the rotor magnet 32 and in which the rotating blade member 12 is rotated, is provided.

Therefore, the magnetic path is generated by energizing the coil portion 104, which is disposed to be located in the periphery of the rotor magnet 32.

As a result, through the rotor magnet accommodating portion 56 of the lower main body casing 48, it effects to the rotor magnet 32 provided under the impeller member 16.

As a result, stably rotating of the rotating blade member 12 can be attained.

Therefore, the operation loss of the driving motor (the coil portion 104 and the rotor magnet 32) is never caused, and a centrifugal pump which has an excellent pump performance can be provided.

Moreover, the upper main body casing 36 and the lower main body casing 48 that compose a metallic main body casing 34, for instance, can be fixed by heating such as the welding, the brazing, and the adhesion, etc., so that they can be fixed in the sealing state.

That is, it is a structure in which a joint method with high airtight and maintenance strength such as the welding and the brazing can be applied to these connecting portions.

Therefore, fixing by heating such as the welding, the brazing, and the adhesion, etc. can be applied.

As a result, the centrifugal pump, in which for instance, a refrigerant, a combustible fluid, and the fluid having a toxicity are circulated in the closed circuit, and in which the resisting pressure, airtight, and resistance to corrosion are required, can be provided.

Moreover, the joint portion between the upper main body casing 36 of the metallic main body casing 34 and the blade casing 68, for instance, can be fixed by heating such as the welding, the brazing, and the adhesion, etc., so that they can be fixed in the sealing state.

Moreover, the joint portion between the metallic suction side coupling member 42 and the main body casing 34, and the joint portion between the discharge side coupling member 46 and the main body casing 34, for instance, can be fixed by heating such as the welding, the brazing, and the adhesion, etc., so that they can be fixed in the sealing state.

That is, it is a structure in which a joint method with high airtight and maintenance strength such as the welding and the brazing can be applied to these connecting portions.

Therefore, it can be fixed by heating such as the welding, the brazing, and the adhesion, etc. and the metal casing and the piping having high airtight can be used.

Moreover, the centrifugal pump, in which for instance, a refrigerant, a combustible fluid, and the fluid having a toxicity are circulated in the closed circuit, and in which the resisting pressure, airtight, and resistance to corrosion are required, can be offered.

Moreover, the blade casing 68,

which partitions an interior space S1 formed by the upper main body casing 36 and the lower main body casing 48 so that

a fluid introducing passage 84 is formed at an upper portion, and

a rotating accommodating space S2 that accommodates the rotating blade member 12 is formed at a lower portion, is provided.

As a result, the path of the fluid can be easily formed.

In this case, it is preferable that the lower main body casing 34 comprises a metallic press molding article, and

the suction side coupling member 42 and the discharge side coupling member 46 comprises the metal pipe.

As a result, joint method with high airtight and maintenance strength such as the welding and the brazing can be applied to these connecting portions.

Moreover, the cost can be reduced.

Embodiment 2

FIG. 4 is a partial enlarged sectional view similar to FIG. 2 in which another Embodiment of the centrifugal pump is shown.

FIG. 5 is a partial enlarged sectional view of FIG. 4.

The centrifugal pump 10 of this Embodiment is basically similar composition of the Embodiment shown in FIG. 1-FIG. 3.

The same reference numerals refer to the same composition members, and the detailed explanation is omitted.

In the centrifugal pump 10 of this Embodiment, as shown in FIG. 4 and FIG. 5, lower part of the flange 44 of the side peripheral wall 40 of the upper main body casing 36, on a vicinity of the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68, i.e. lower part thereof in this Embodiment, a groove for flow stop 140 which prevents the fixing material from flowing is formed.

In this Embodiment, the groove for flow stop 140 has a substantially triangular shape in cross section, which is formed by notching an inner wall 41 of a lower part of the flange 44 of the side peripheral wall 40 of the upper main body casing 36.

In addition, as for the cross-sectional shape of this groove for flow stop 140, if the flow prevention of the fixing material can be expected, it is not especially limited.

For instance, as for the groove for flow stop 140, various shapes such as a rectangular cross-sectional shape, a hemicycle etc. can be adopted.

Moreover, the number of the grooves for flow stop 140 is not limited.

For instance, it is also possible to dispose a plurality of grooves for flow stop 140 at the predetermined space.

In this case, it can be changed mutually as depth and the shape etc. of the groove for flow stop 140.

By composing like this, as shown in FIG. 4 and FIG. 5, on a lower part of the flange 44 of the side peripheral wall 40 of the upper main body casing 36, on a vicinity of the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68, the groove for flow stop 140 is formed.

Therefore, as shown by arrow F of FIG. 4 and FIG. 5, by the groove for flow stop 140, for instance, the fixing material, such as an electrode in the welding, a wax material in the brazing, and an adhesion material at the adhesion, can be prevented from flowing.

As a result, the welding, the brazing, and the adhesion can be never obstructed, an extra fixing material can be reduced, and the cost can be reduced.

In addition, the flowing of the fixing material can be prevented by the groove for flow stop 140.

As a result, obstruction of the fluid flow by hardening of the fixing material can be prevented and the efficiency of the centrifugal pump 10 is not decreased.

Moreover, it may be only to be formed by notching the upper main body casing 36.

As a result, the processing is easy and the cost can be reduced.

In this Embodiment, the groove for flow stop 140 is formed to the side of the upper main body casing 36.

However, though not shown in the drawings, for instance, depending in the direction of the welding, brazing, and the adhesion, it is also possible to form the groove for flow stop 140 on a vicinity of the fixing portion 70 a at the side of blade casing 68.

In addition, it is also possible in both the side of the upper main body casing 36 and the side of the blade casing 68 to form the groove for flow stop 140 on a vicinity of the fixing portion 70 a.

Embodiment 3

FIG. 6 is a partial enlarged sectional view similar to FIG. 2 in which another Embodiment of the centrifugal pump is shown.

The centrifugal pump 10 of this Embodiment is basically similar composition of the Embodiment shown in FIG. 1-FIG. 5.

The same reference numerals refer to the same composition members, and the detailed explanation is omitted.

In the centrifugal pump 10 of this Embodiment, as shown in FIG. 6, on a vicinity of the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68, i.e. lower part thereof in this Embodiment, a groove for flow stop 142 which prevents the fixing material from flowing is formed.

In this Embodiment, the groove for flow stop 140 is a groove for flow stop 142, in which the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68 is formed to the groove shape.

That is, in this Embodiment, the groove for flow stop 142 comprises:

an extending portion 142 a, in which the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68 extends in a vertical direction,

a bending portion 142 b, which is bent from this extending portion 142 a in a radial outside direction.

That is, the groove for flow stop 142 c comprises this extending portion 142 a and the bending portion 142 b.

By composing like this, as shown in arrow G of FIG. 6, by the groove for flow stop 142, for instance, the fixing material, such as an electrode in the welding, a wax material in the brazing, and an adhesion material at the adhesion, can be prevented from flowing.

As a result, the welding, the brazing, and the adhesion can be never obstructed, an extra fixing material can be reduced, and the cost can be reduced.

In addition, the flowing of the fixing material can be prevented by the groove for flow stop 142.

As a result, obstruction of the fluid flow by hardening of the fixing material can be prevented and the efficiency of the centrifugal pump 10 is not decreased.

By composing like this, it may be only to form the groove for flow stop 142 to the groove shape by bending the fixing portion 70 a of outer periphery flange 70 of blade casing 68, for instance, by press work etc.

As a result, the groove 142 c may only be formed by the extending portion 142 a and the bending portion 142 b so that it is formed to the groove shape.

Consequently, the processing is easy and the cost can be reduced.

In this Embodiment, the groove for flow stop 142 is formed on the side of the blade casing 68.

However, though not shown in the drawing, for instance, depending in the direction of the welding, brazing, and the adhesion, it is also possible to form the groove for flow stop 142 on a vicinity of the fixing portion 70 a at the side of the upper main body casing 36.

In addition, it is also possible in both the side of the upper main body casing 36 and the side of the blade casing 68 to form the groove for flow stop 142 on a vicinity of the fixing portion 70 a.

Embodiment 4

FIG. 7 is a partial enlarged sectional view similar to FIG. 2 in which another Embodiment of the centrifugal pump is shown.

The centrifugal pump 10 of this Embodiment is basically similar composition of the Embodiment shown in FIG. 1-FIG. 6.

The same reference numerals refer to the same composition members, and the detailed explanation is omitted.

In the centrifugal pump 10 of this Embodiment, as shown in FIG. 7, on a vicinity of the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68, i.e. lower part thereof in this Embodiment, a groove for flow stop 144 which prevents the fixing material from flowing is formed.

In this Embodiment, the groove for flow stop 144 is formed by providing a groove forming member 144 a for the groove forming on a vicinity of the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68.

That is, the groove forming member 144 a is provided with a fixing portion 144 b, which is fixed, for instance, by the welding, brazing, and the adhesion, on the vicinity of the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68.

Moreover, a taper slope 144 c, which is inclined as enlarged downwardly from this fixing portion 144 b, and a horizontal tip portion 144 d are provided.

In addition, a groove 144 e is formed by these taper slope 144 c and horizontal tip portion 144 d.

By composing like this, as shown in arrow H of FIG. 7, by the groove for flow stop 144, for instance, the fixing material, such as an electrode in the welding, a wax material in the brazing, and an adhesion material at the adhesion, can be prevented from flowing.

As a result, the welding, the brazing, and the adhesion can be never obstructed, an extra fixing material can be reduced, and the cost can be reduced.

In addition, the flowing of the fixing material can be prevented by the groove for flow stop 144.

As a result, obstruction of the fluid flow by hardening of the fixing material can be prevented and the efficiency of the centrifugal pump 10 is not decreased.

By composing like this, the groove for flow stop 144 can be formed by providing a groove forming member 144 a for the groove forming on a vicinity of the fixing portion 70 a of the outer periphery flange 70 of the blade casing 68.

As a result, the blade casing 68 itself need not be processed to the complicate shape.

Consequently, the processing is easy and the cost can be reduced.

In this Embodiment, the groove for flow stop 144 is formed on the side of the blade casing 68.

However, though not shown in the drawing, for instance, depending in the direction of the welding, brazing, and the adhesion, it is also possible to form the groove for flow stop 144 on a vicinity of the fixing portion 70 a at the side of the upper main body casing 36.

In addition, it is also possible in both the side of the upper main body casing 36 and the side of the blade casing 68 to form the groove for flow stop 144 on a vicinity of the fixing portion 70 a.

Embodiment 5

FIG. 8 is schematic cross-sectional view in which another Embodiment of the centrifugal pump is shown.

The centrifugal pump 10 of this Embodiment is basically similar composition of the Embodiment shown in FIG. 1-FIG. 7.

The same reference numerals refer to the same composition members, and the detailed explanation is omitted.

In addition, in FIG. 8, for convenience′ sake of clarification, the main body casing 34 (i.e. the upper main body casing 36, the lower main body casing 48, and the blade casing 68) and the suction side coupling member 42 and the discharge side coupling member 46 are only shown, and other members are omitted and shown.

In the centrifugal pump of the Embodiment 1-Embodiment 4 shown in FIG. 1-FIG. 7, as for the blade casing 68, an outer periphery flange (i.e. edge) 70 of this blade casing 68 is sealingly fixed under the flange 44 of the side peripheral wall 40 of the upper main body casing 36 for instance, by such as the welding, the brazing and the adhesion.

On the contrary, in the centrifugal pump 10 of this Embodiment, as shown in FIG. 8, the outer periphery flange (i.e. edge) 70 is sealingly fixed to the outer periphery flange 52 of the lower main body casing 48 for instance, by such as the welding, the brazing and the adhesion.

By composing like this, the edge of the blade casing 68 (i.e. the outer periphery flange 70 of the blade casing 68) is fixed sealingly to the lower main body casing 48.

As a result, there is a sealing state between the blade casing 68 and the lower main body casing 48.

Therefore, since it is the fixing of two members between the blade casing 68 and the lower main body casing 48, fear that the clearance is generated, is a little.

It need not to press fit, weld, and it is easy to fix, for instance by the welding, the brazing, and the adhesion, etc.

Moreover, as shown in FIG. 11, the complex structure, in which sealing member 244 such as O ring and gaskets is provided in the sealing member installation groove 242, need not be adopted.

In addition, the sealing member 244 is not deteriorated by the time elapse, and deterioration is not advanced by the fluid. As a result, the leakage is not caused in the sealing portion, the backflow is not generated, and the efficiency of the centrifugal pump is not decreased.

In addition, the sealing member installation groove 242 need not be formed like this.

Therefore, a lot of manufacturing processes can be unnecessary, and the cost can be reduced because of a simplified structure.

Moreover, the centrifugal pump can be made compact.

Moreover, in case of the brazing, when the suction side coupling member 42 and the discharge side coupling member 46 are brazed to the main body casing 34 (i.e. the upper main body casing 36 and the lower main body casing 48), brazing is possible by the same atmosphere, and it can be processed at the same time.

The manufacturing process can be simplified, and the cost can be reduced.

Moreover, though not shown in drawings, even in case of this Embodiment,

at least one of the lower main body casing 48 and the blade casing 68 can be adopted including,

the groove for flow stop having a notch shape similar to Embodiment 2,

the groove for flow stop which is formed to groove shape similar to Embodiment 3, or

the groove for flow stop according to providing the groove forming member for the groove forming similar to Embodiment 4.

Although preferable embodiment is described above, embodiments are not limited to this embodiment.

For instance, in the embodiments, the coil portion 104 is accommodated in the coil cover main body 114, and it is covered by the coil cover 111.

However, the coil portion 104 can be molded with the molding resin, and this coil portion 104 can be provided under the main body casing 34 detachably.

In addition, in the Embodiment, the number of the suction side coupling member 42 and the discharge side coupling member 46 is assumed to be one piece respectively.

However, the number of suction side coupling member 42 and discharge side coupling member 46 can be plurality.

Therefore, various changes are possible in the scope in which it does not deviate from the objects.

INDUSTRIAL APPLICABILITY

Embodiments relate to a centrifugal pump and a method of producing of the centrifugal pump to circulate the fluid in the closed circuit, for instance, refrigerant used for refrigerant circulation circuits such as air conditioners and freezers, and cooling water etc. used for cooling circulation circuits such as parts and apparatuses that generate heat.

Moreover, this centrifugal pump is a centrifugal pump in which the resisting pressure and airtight are required.

An excellent centrifugal pump in the pump performance is provided.

In the centrifugal pump, it can be fixed by heating such as the welding, the brazing, and the adhesion, etc. and the metal casing and the piping having high airtight can be used.

Moreover, the centrifugal pump can be used for the centrifugal pump, in which for instance, a refrigerant, a combustible fluid, and the fluid having a toxicity are circulated in the closed circuit, and in which the resisting pressure, airtight, and resistance to corrosion are required.

EXPLANATION OF LETTERS OR NUMERALS

-   10 Centrifugal pump -   12 Rotating blade member -   14 Bearing portion -   16 Impeller member -   18 Base edge . . . -   20 Enlarged diameter portion -   22 Outside blade portion -   24 Rotor magnet accommodating portion -   24 Flange portion -   26 Support portion -   28 Installation portion -   30 Rotor magnet -   32 a Setting hole -   34 Main body casing -   36 Upper main body casing -   38 Top wall -   38 a Protruding portion -   40 Side peripheral wall -   40 a Opening portion -   40 b Opening portion -   41 Inner wall -   42 Suction side coupling member -   42 a Tip -   42 Flange -   44 Discharge side coupling member -   46 Lower main body casing -   50 Flange -   51 Lower end -   52 Outer periphery flange -   54 Blade accommodating portion -   56 Rotor magnet accommodating portion -   58 Lower bearing member accommodating portion -   60 Lower bearing member -   61 Thrust washer -   62 Shaft hole -   64 Axial member -   66 Lower end portion -   68 Blade casing -   70 Outer periphery flange -   70 a Fixing portion -   70 b Abutting portion -   71 Fixing holder -   72 Side peripheral wall -   72 a Opening portion -   73 Thrust washer -   74 Extending portion -   74 a Inner periphery side opening portion -   78 Upper bearing member -   80 Shaft hole -   82 The top portion -   84 Fluid introducing passage -   96 Main body casing side fixing bracket -   98 Engaging portion -   104 Coil portion -   106 Bobbin case -   108 Winding wire -   110 Coil -   111 Coil cover -   112 Electronic substrate -   112 a Accommodating opening portion -   114 Coil cover main body -   114 a Coil installation portion -   114 b Opening portion -   116 Coil side fixing protrude portion -   118 Accommodating opening portion -   124 Engaging piece -   126 Connector -   128 Lead line -   130 Magnetic pole sensor -   140 Groove for flow stop -   142 Groove for flow stop -   142 a Extending portion -   142 b Bending portion -   142 c Groove -   144 Groove for flow stop -   144 a Groove forming member -   144 b Fixing portion -   144 c Taper slope -   144 d Tip portion -   144 e Groove -   200 Centrifugal pump -   204 Main body casing -   206 Upper main body casing -   208 Top wall -   210 Side peripheral wall -   210 a Opening portion -   210 b Opening portion -   212 Suction side coupling member -   216 Lower main body casing -   218 Lower end -   220 Outer periphery flange -   222 Blade casing -   224 Outer periphery flange -   226 Fluid introducing passage -   230 Discharge side coupling member -   232 Side peripheral wall -   240 Joint portion -   242 Sealing member installation groove -   244 Sealing member -   A-H Arrow -   S1 Interior space -   S2 Rotating accommodating space 

What is claimed:
 1. A centrifugal pump comprising: a metallic main body casing in which a rotating blade member is accommodated, the metallic main body casing including; an upper main body casing, a lower main body casing which is fixed to the upper main body casing, and a blade casing, which partitions an interior space formed by the upper main body casing and the lower main body casing so that a fluid introducing passage is formed at an upper portion, and a rotating accommodating space that accommodates the rotating blade member is formed at a lower portion, wherein an edge of the blade casing is airtightly fixed to the upper main body casing or the lower main body casing.
 2. The centrifugal pump of claim 1, wherein the edge of the blade casing is airtightly fixed by welding, brazing or adhesion.
 3. The centrifugal pump of claim 2, wherein on a vicinity of a fixing portion of at least one of the upper main body casing, the blade casing, and the lower main body casing, a groove for flow stop which prevents the fixing material from flowing is formed.
 4. The centrifugal pump of claim 3, wherein the groove for flow stop is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing.
 5. The centrifugal pump of claim 3, wherein the groove for flow stop is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing to a groove shape.
 6. The centrifugal pump of claim 3, wherein the groove for flow stop is formed by providing a groove forming member for the groove forming to at least one of the upper main body casing, the blade casing, and the lower main body casing.
 7. A method of producing of a centrifugal pump, wherein the centrifugal pump comprises: a metallic main body casing in which a rotating blade member is accommodated, the main body casing comprising; an upper main body casing, a lower main body casing which is fixed to the upper main body casing, and a blade casing, which partitions an interior space formed by the upper main body casing and the lower main body casing so that a fluid introducing passage is formed at an upper portion, and a rotating accommodating space that accommodates the rotating blade member is formed at a lower portion, the method comprising: airtightly fixing an edge of the blade casing to the upper main body casing or the lower main body casing.
 8. The method of producing of the centrifugal pump of claim 7, wherein the edge of the blade casing is airtightly fixed by welding, brazing or adhesion.
 9. The method of producing of the centrifugal pump of claim 8, wherein on a vicinity of a fixing portion of at least one of the upper main body casing, the blade casing, and the lower main body casing, forming a groove for flow stop which prevents the fixing material from flowing.
 10. The method of producing of the centrifugal pump of claim 9, wherein the groove for flow stop is a groove for flow stop, which is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing.
 11. The method of producing of the centrifugal pump of claim 9, wherein the groove for flow stop is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing to a groove shape.
 12. The method of producing of the centrifugal pump of claim 9, wherein the groove for flow stop is formed by providing a groove forming member for the groove forming to at least one of the upper main body casing, the blade casing, and the lower main body casing. 